Temperature-driven reorganization of electronic order in 
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Stahl, Quirin; Chen, Dong; Ritschel, Tobias; Shekhar, Chandra; Sadrollahi, E.; Rahn, M. C.; Ivashko, Oleh; Zimmermann, M. v.; Felser, Claudia; Geck, J.

doi:10.1103/physrevb.105.195136

Cited by 57 publications

(28 citation statements)

References 30 publications

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“…The non-monotonic evolution of T CDW with a reduction of flake thickness is rare. In the bulk AV 3 Sb 5 , the CDW order exhibits a 3D character with 2 × 2 × 2 or 2 × 2 × 4 structural reconstruction 28 , 39 , 62 , 63 . It is generally believed that EPC plays a crucial role in promoting the CDW order 47 , 50 – 52 in bulk kagome metals despite the absence of phonon softening across the transition, which may be related to the failure of the conduction electrons to screen the phonon vibration 50 , 64 .…”

Section: Discussionmentioning

confidence: 99%

Anomalous enhancement of charge density wave in kagome superconductor CsV3Sb5 approaching the 2D limit

Song

Ying

et al. 2023

Nat Commun

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The recently discovered kagome metals AV3Sb5 (A = Cs, Rb, K) exhibit a variety of intriguing phenomena, such as a charge density wave (CDW) with time-reversal symmetry breaking and possible unconventional superconductivity. Here, we report a rare non-monotonic evolution of the CDW temperature (TCDW) with the reduction of flake thickness approaching the atomic limit, and the superconducting transition temperature (Tc) features an inverse variation with TCDW. TCDW initially decreases to a minimum value of 72 K at 27 layers and then increases abruptly, reaching a record-high value of 120 K at 5 layers. Raman scattering measurements reveal a weakened electron-phonon coupling with the reduction of sample thickness, suggesting that a crossover from electron-phonon coupling to dominantly electronic interactions could account for the non-monotonic thickness dependence of TCDW. Our work demonstrates the novel effects of dimension reduction and carrier doping on quantum states in thin flakes and provides crucial insights into the complex mechanism of the CDW order in the family of AV3Sb5 kagome metals.

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Section: Discussionmentioning

confidence: 99%

Anomalous enhancement of charge density wave in kagome superconductor CsV3Sb5 approaching the 2D limit

Song

Ying

et al. 2023

Nat Commun

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“…At ambient pressure, a CDW in AV 3 Sb 5 sets in at T CDW ∼78 K, 93 K and 103 K for A = K, Cs and Rb, respectively. For CsV 3 Sb 5 there have been several reports based on high energy x-ray diffraction [21,22,37] and resonant x-ray diffraction at the V and Sb absorption edges. [38] Few groups [21,22,39] have reported the occurrence of a CDW instability in CsV 3 Sb 5 which is three-dimensional in nature, with a resulting 2 × 2 × 4 superstructure.…”

Section: Superlattice Peaksmentioning

confidence: 99%

“…X-ray diffraction measurements show that the CDW is characterised by a unit cell doubling along both a and b direction, and a quadrupling along the c axis [20][21][22]. Distinct CDW phases were theoretically shown to be energetically favorable, leading to the tunability of type of CDW order by an external parameter such as temperature, pressure or doping [15,[23][24][25][26][27].…”

Section: Introductionmentioning

confidence: 99%

Resonant x-ray diffraction measurements in charge ordered kagome superconductors KV₃Sb₅ and RbV₃Sb₅

Scagnoli,

Riddiford,

Huang

et al. 2024

J. Phys.: Condens. Matter

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We report on (resonant) x-ray diffraction experiments on the normal state properties of kagome- lattice superconductors KV3Sb5 and RbV3Sb5. We have confirmed previous reports indicating that the charge density wave phase is characterized by a doubling of the unit cell in all three crystallographic directions. By monitoring the temperature dependence of Bragg peaks associated with the charge density wave phase, we ascertained that it develops gradually over several degrees, as opposed to CsV3Sb5, where the charge density wave peak intensity saturates promptly just below the charge density wave transition temperature. Diffraction measurements close to the V K edge and the Sb L1 edge show no sensitivity to inversion- or time-symmetry breaking, which are claimed to be associated with the onset of the charge density wave phase. Resonant diffraction intensity observed at the Sb L1 edge is associated with the anisotropy of the electron density of some of the Sb ions.

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“…The 2×2×1 CDW, i.e., the star of David (SD) and inverse star of David (ISD) 4 structures, have been commonly adopted to understand various experiments and conceive theoretical models. Recent experiments suggest two-fold or four-fold interlayer modulation with alternative SD and ISD layers 6,28, [43][44][45][46][47] .…”

Section: Introductionmentioning

confidence: 99%

Emergent topological quantum orbits in the charge density wave phase of kagome metal CsV$_3$Sb$_5$

Tan¹,

Li²,

Liu³

et al. 2023

Preprint

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The recently discovered kagome materials AV3Sb5 (A = K, Rb, Cs) attract intense research interest in intertwined topology, superconductivity, and charge density waves (CDW). Although the in-plane 2 × 2 CDW is well studied, its out-of-plane structural correlation with the Fermi surface properties is less understood. In this work, we advance the theoretical description of quantum oscillations and investigate the Fermi surface properties in the three-dimensional CDW phase of CsV3Sb5. We derived Fermi-energy-resolved and layer-resolved quantum orbits that agree quantitatively with recent experiments in the fundamental frequency, cyclotron mass, and topology. We reveal a complex Dirac nodal network that would lead to a π Berry phase of a quantum orbit in the spinless case. However, the phase shift of topological quantum orbits is contributed by the orbital moment and Zeeman effect besides the Berry phase in the presence of spin-orbital coupling (SOC). Therefore, we can observe topological quantum orbits with a π phase shift in otherwise trivial orbits without SOC, contrary to common perception. Our work reveals the rich topological nature of kagome materials and paves a path to resolve different topological origins of quantum orbits.

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Temperature-driven reorganization of electronic order in CsV3Sb5

Cited by 57 publications

References 30 publications

Anomalous enhancement of charge density wave in kagome superconductor CsV3Sb5 approaching the 2D limit

Anomalous enhancement of charge density wave in kagome superconductor CsV3Sb5 approaching the 2D limit

Resonant x-ray diffraction measurements in charge ordered kagome superconductors KV₃Sb₅ and RbV₃Sb₅

Emergent topological quantum orbits in the charge density wave phase of kagome metal CsV$_3$Sb$_5$

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Temperature-driven reorganization of electronic order in CsV3Sb5

Cited by 57 publications

References 30 publications

Anomalous enhancement of charge density wave in kagome superconductor CsV3Sb5 approaching the 2D limit

Anomalous enhancement of charge density wave in kagome superconductor CsV3Sb5 approaching the 2D limit

Resonant x-ray diffraction measurements in charge ordered kagome superconductors KV3Sb5 and RbV3Sb5

Emergent topological quantum orbits in the charge density wave phase of kagome metal CsV$_3$Sb$_5$

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Resonant x-ray diffraction measurements in charge ordered kagome superconductors KV₃Sb₅ and RbV₃Sb₅